"Federal Reserve staff are actively considering additional measures that could address these and other residual risks in the short-term wholesale funding markets."

She pointed to a study by the Basel Committee suggesting there would be net social gains from further reforms.

"While it would be a mistake to give undue weight to any one study, this study provides some support for the view that there might be room for stronger capital and liquidity standards for large banks than have been adopted so far," she said.

The short-term wholesale funding market has been a focus of Fed officials for some time, with some warning it was a major unaddressed legacy of the financial crisis. Big banks and corporations use that market to fulfill some of their cash needs.

Late last year, Fed governor Daniel Tarullo gave a speech in which he outlined proposals to address those risks, including the prospect of extra capital requirements for businesses that used the short-term funding market.